Sparky12

This was, more or less, exactly why I thought of this to begin with. But I think maybe I should embrace the inline-6 L-series engine's torquey nature instead of trying to fight it.

Sounds fun, except I wasn't really thinking of a stroker at all. My idea would be more like an L24 that's been bored waay over. I like the short stroke idea because it would be able to rev quicker (i.e. from idle-redline sooner than an L28 or an L31 would) because the piston speed at redline would be lower. Only downside I see to this is that I'm basically taking out the torque from an inline 6 (which is naturally torquey)...am I thinking in the wrong direction?

I think I know exactly what you mean. I guess what I'm looking for is the most rev-happy engine that would still run on pump gas and would hold together for more than a few hours. Obviously, a 13:1 12,000rpm 300whp 2.5 liter wouldn't be able to satisfy the other requirements. What do you think would be the limits of compression ratio, engine speed, and cam duration where it would still be durable and not require a trip to the local airport for fuel?

That's actually more or less exactly what I was aiming for. I was thinking about a 300deg (intake and exahust) cam with 560 lift which, if I read right, is about as big a cam as anybody would want to try and drive on a stret car. Would this cam be about what I need? Also, would you shoot for a higher compression ratio? I'd like to stick to 93 octane if I can.

Alright, so how would this setup sound, experienced Z gurus? L28 block, bored 0.40 over L24 rods L24 crank L28 flattop pistons 0.40 oversized on a shaved P90 head with 1mm headgasket, with a hot street/mild race cam and 44mm mikuni's? The Lengine calculator gives me a displacement of 2629cc's, with a stock (0.080mm) deck height, with an 87mm bore and 73.7mm stroke (stroke/bore ratio of 0.85). I put an N47 head on it (close to the same compression ratio a shaved P90 would give?) and it gives me a 9.72:1 cr. I'm looking for a rev-happy, high-rpm street engine...would this be a step in the right direction?

Is the car a 5-speed too? 2-door 810's are super-rare, so consider yourself lucky! For more power out of the engine, you'd probably be best off swapping to a larger engine. The 2.8 liter from the fuel-injected 280Z and ZX would fit very neatly, and the 2.8 liter turbo (L28ET) from the 280ZX would be a killer setup! Oh, and I think we all want to see pictures of the car

BUMP! How about an update?

Ah, cool! To the original poster (or anyone else who wants to answer), you used a j30 subframe with mostly s14 parts on the rest of the rear end, with q45 hubs and axles...how much wider was the s14 subframe than the j30? Would an s13 subframe (which I've read to understand is the same design) be any narrower? Anyone have experience using the Skyline or Z32 subframes? I'm not getting a Velo Rosso kit for my Z, just good ol ZG flares, so I don't know if I could get away with a wheelbase that's as wide as yours.

I'm confused...what's the point of getting a HICAS rear just to buy an eliminator for it? Sorry for the newb question.

FYI, the STi has an r180 LSD rear end. Not sure what type of LSD though...probably Torsen?